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[Raymond <1329191@xxxxxxxxxxxxxxxxxx>]

Do internal mic use both left and right channel of node 0x0d?  Try mute
either left or right amp in value of ADC

You need to find the missing headset mic from the remaining unconnected
pin complex which pincap support IN

Node 0x0d [Pin Complex] wcaps 0x41048b: Stereo
 Amp-In Control: name="Mic Boost Volume", index=0, device=0 ControlAmp: chs=3, dir=In, idx=0, ofs=0
Amp-In caps: ofs=0x00, nsteps=0x03, stepsize=0x27, mute=0 
Amp-In vals: [0x02 0x02] 
Pincap 0x00001764: IN Detect Balanced 
Vref caps: HIZ 50 GRD 80 
Pin Default 0x90a00110: [Fixed] Mic at Int N/A Conn = Unknown, Color = Unknown DefAssociation = 0x1, Sequence = 0x0 Misc = NO_PRESENCE
 
Pin-ctls: 0x24: IN VREF_80 Unsolicited: tag=00, enabled=0
 
Power states: D0 D3 EPSS 
Power: setting=D0, actual=D0 Delay: 1 samples

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https://bugs.launchpad.net/bugs/1329191

Title:
  [MacBookAir5,1, Cirrus Logic CS4206, Blue Line In, Rear] Line In using
  TRRS plug does not work correctly

Status in alsa-driver package in Ubuntu:
  Confirmed

Bug description:
  Microphone connected via TRRS plug on Macbook Air 5,1 is not
  recognised. Selecting "Analogue In" in Pulseaudio mixer is same as
  selecting "Microphone" - i.e. sounds recorded are always the Internal
  microphone, and not the microphone connected via the TRRS plug. When
  using OSX however, the TRRS microphone works correctly.

  Have tried booting Live CDs of 12.04, 13.04, and 14.04, and even tried
  upgrading kernel to 3.15, and problem persists.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: alsa-base 1.0.25+dfsg-0ubuntu4
  ProcVersionSignature: Ubuntu 3.13.0-29.53-generic 3.13.11.2
  Uname: Linux 3.13.0-29-generic x86_64
  NonfreeKernelModules: wl
  ApportVersion: 2.14.1-0ubuntu3.2
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  scrosby    2172 F.... pulseaudio
   /dev/snd/pcmC0D0c:   scrosby    2172 F...m pulseaudio
  CurrentDesktop: Unity
  Date: Thu Jun 12 16:58:10 2014
  InstallationDate: Installed on 2014-02-24 (107 days ago)
  InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Alpha amd64+mac (20140223)
  PackageArchitecture: all
  SourcePackage: alsa-driver
  Symptom: audio
  Symptom_AlsaRecordingTest: ALSA recording test through plughw:PCH successful
  Symptom_Card: Built-in Audio - HDA Intel PCH
  Symptom_Jack: Blue Line In, Rear
  Symptom_PulseAudioRecordingTest: PulseAudio recording test through plughw:PCH failed
  Symptom_Type: Only some of inputs are working
  Title: [MacBookAir5,1, Cirrus Logic CS4206, Blue Line In, Rear] Recording problem
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 11/27/2012
  dmi.bios.vendor: Apple Inc.
  dmi.bios.version: MBA51.88Z.00EF.B02.1211271028
  dmi.board.asset.tag: Base Board Asset Tag#
  dmi.board.name: Mac-66F35F19FE2A0D05
  dmi.board.vendor: Apple Inc.
  dmi.board.version: MacBookAir5,1
  dmi.chassis.type: 10
  dmi.chassis.vendor: Apple Inc.
  dmi.chassis.version: Mac-66F35F19FE2A0D05
  dmi.modalias: dmi:bvnAppleInc.:bvrMBA51.88Z.00EF.B02.1211271028:bd11/27/2012:svnAppleInc.:pnMacBookAir5,1:pvr1.0:rvnAppleInc.:rnMac-66F35F19FE2A0D05:rvrMacBookAir5,1:cvnAppleInc.:ct10:cvrMac-66F35F19FE2A0D05:
  dmi.product.name: MacBookAir5,1
  dmi.product.version: 1.0
  dmi.sys.vendor: Apple Inc.
  modified.conffile..etc.modprobe.d.alsa.base.conf: [deleted]

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